I had the exact same problem a few years back when I bought and tried to use a QA32A on my 147. I tried shifting the motor and the cast frame the belt was rubbing on with no luck. I pulled the snowthrower frame apart thinking I would be able to shift the gearbox. This didn't work. I verified the pulley diameter was correct. I checked various forums online and found people that had the same issue but never found a fix for my problem. I finally gave in and remove the cast frame. Ground a relief notch for the belt, approximately 1" wide and 3/8" deep (if I recall I left it a bit proud of the frame, that way if it did still rub it wouldn't wear into the frame). Then reinstalled everything. I haven't seen any draw backs to this fix.
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